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/*
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* G.723.1 demuxer |
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* Copyright (c) 2010 Mohamed Naufal Basheer |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* G.723.1 demuxer |
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*/ |
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#include "libavutil/audioconvert.h" |
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#include "avformat.h" |
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#include "internal.h" |
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static const uint8_t frame_size[4] = { 24, 20, 4, 1 }; |
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static int g723_1_init(AVFormatContext *s) |
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{ |
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AVStream *st; |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = CODEC_ID_G723_1; |
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st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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st->codec->channels = 1; |
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st->codec->sample_rate = 8000; |
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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st->start_time = 0; |
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return 0; |
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} |
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static int g723_1_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int size, byte, ret; |
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pkt->pos = avio_tell(s->pb); |
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byte = avio_r8(s->pb); |
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size = frame_size[byte & 3]; |
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ret = av_new_packet(pkt, size); |
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if (ret < 0) |
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return ret; |
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pkt->data[0] = byte; |
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pkt->duration = 240; |
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pkt->stream_index = 0; |
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ret = avio_read(s->pb, pkt->data + 1, size - 1); |
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if (ret < size - 1) { |
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av_free_packet(pkt); |
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return ret < 0 ? ret : AVERROR_EOF; |
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} |
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return pkt->size; |
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} |
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AVInputFormat ff_g723_1_demuxer = { |
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.name = "g723_1", |
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.long_name = NULL_IF_CONFIG_SMALL("G.723.1 format"), |
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.read_header = g723_1_init, |
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.read_packet = g723_1_read_packet, |
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.extensions = "tco", |
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.flags = AVFMT_GENERIC_INDEX |
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}; |
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